Double backrest of a chair



The double backrest of a chair is part of a piece of furniture, such as a chair. The double backrest supports the back of a user, just as a regular backrest of a chair.

FIG. 1 is an upper perspective view of the double backrest of a chair showing my design.

FIG. 2 is a reduced front view thereof;

FIG. 3 is a reduced back view thereof;

FIG. 4 is a reduced side view thereof;

FIG. 5 is a reduced opposite side view thereof;

FIG. 6 is top view thereof; and

FIG. 7 is a reduced bottom view thereof; and,

FIG. 8 is another reduced perspective view showing attachment to a chair in broken lines.

The broken lines are presented for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a double backrest of a chair, as shown and described. 